1: Alot of that depends on what you think a significant exp drop is. Details of the exp formula can be found
here.
The level limit there appears to be wrong in the example, but the original formula appears correct. It should be the highest level = lowest level + (lowest level / 2) + 1. In the example, it should be 46 + (46 / 2) + 1 = 46 + 23 + 1 = 70.
2: Also varying opinions. Hot zones (which can be found on the left, under Zones section, Hot zones link) have experience banus. Dranik Scar is listed as the 50 hot zone. Acrylia Caverns is the 55 hot zone. You may be able to get descent exp at other ones, depending on your equipment and skill. Much of where you can get good experience depends on the group make up. Some areas or types of NPCs require certain skills that only a few classes may have.
Hot zones are also more likely to have more people in them looking for groups or people to join their group.
3: Another personal choice. If you are tanking alot, AC is the most important with HPs a second. How to compare these varies alot, but most sites and people I've talked to, generally use somewhere from 5-10 HPs / 1 AC as a comparison for tanking / melee classes. Opinions on stats varies alot. Personally, I like to get Str over 150 for any melee type class and really closer to 200 by your level and unbuffed. Similarly, Int or Wis to the same points for casters and their hybrid cousins, or priests and their hybrid cousins, respectively. For rogues and rangers, I generally try to keep Dex up there also. Rangers even more so, when they start getting AAs, especially Archery Mastery.
Resists are also nice to get high, but not extremely important until you get to raid content. Group content spell effects are generally dealt without much trouble. Focus effects are also great, and I try to get several on priests and casters. Mana preservation being one of them, which is great for a Bard also. Mana regeneration is key to Bards also, as it's the only way to mana back quicker as spells and songs, do nothing for Bards mana regen.
Similarly regeneration is nice for everyone, but many consider it much less important since the changes in out-of-combat regeneration, which applies to HPs, Mana, and Endurance.
You can try reading some class specific forums to see what many other people think about the issue of stats, resists, effects, and HP/Mana/End.
For Bards, try
EQDiva For Rogues, try
The Safehouse You might also want to check out the sticky links at the top of this forum also. Lots of good information in
New / Returning Player Info and
Forum Info and Useful Threads.
==== EDIT ====
Oops thought you were 54, not 56, so added the 55 Hot zone as well. :D
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Yther Ore.
Edited, May 16th 2007 6:38am by Yther